The thickness variations of the anode and
cathode catalyst layers with applied pressure are summarized
in Table 1. The increase in pressure causes an obvious
decrease in the thickness of the anode catalyst layer, which is
reduced from about 10 to 6.2 mm by raising the pressure from
1.0 to 4.0 MPa. On the other hand, there is no noticeable
change observed in the thickness of the cathode catalyst layer
within the applied pressure range with an average value of